Useful websites on optical illusions and inventions

The following websites are good for creativity and thinking skills.

A lot of illusions explained with dozens of examples and pictures
http://www.michaelbach.de/ot/

Videos on cool and neat inventions, great for training
http://www.grand-illusions.com/

neat website with interactive activities on critical and fallacious views and illusions
http://www.sandlotscience.com/

Cool illusions to use has filler items
http://www.colorcube.com/illusions/illusion.htm

More illusions and perceptions from the San Francisco's museum of Science art and human perception but some videos need Quicktime players.
http://www.exploratorium.edu/exhibits/f_exhibits.html

Enjoy